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Shipping, pollution and overfishing have reduced areas of “wilderness” to just 13% of the world’s oceans, a study showed, warning untouched marine habitats could completely vanish within half a century. International researchers analysing the impact of human activity, from fertiliser runoff to increased sea transport, on underwater ecosystems have mapped the dwindling zones considered pristine. The bulk of remaining ocean wilderness, classed as “mostly free of human disturbance”, was found in the Arctic and Antarctic, and around remote Pacific islands.